The kinetics of tryptophan encapsulation (E (%)) in blank
microbeads at a range of volume ratios is shown in Fig. 1. The volume
ratio is the ratio of the volume of microbeads submerged in a
volume of tryptophan solution. As volume ratio increases, the
quantity of protein relative to amount of tryptophan solution
increases. Tryptophan uptake into the microbeads was rapid,